Application of additive in enhancing oxidization of arsenical gold mineral by bacteria

Abstract

The invention provides an application method of an additive in enhancing oxidization of arsenical gold mineral by bacteria. The additive is ammonium persulfate, and the dosage is 20-50% of total amount of the arsenical gold mineral. Two adding modes are adopted, the first adding mode is adding to a leaching system together with bacteria liquid, and the second adding mode is adding to the leachingsystem after bacterial leaching for a certain period of time. When the first adding mode is adopted, the additive mainly contains oxidized arsenical pyrite, the dosage of the additive is increased to50% from 0%, and the oxidation rate of the arsenical pyrite is increased to 95% from 8.7%. When the second adding mode is adopted, the additive mainly contains As(III) in oxidizing solution, the dosage of the additive is increased to 50% from 0%, and the oxidation rate of As(III) is increased to 91.12% from 4.9%. Reproduction and activity of the bacteria are not affected after the additive is added; the oxidation of the arsenical pyrite or As(III) can be obviously enhanced in an oxidization process; the problem of toxicity of a biological oxidation product can be solved, and the application method becomes an important measure for increasing the speed of oxidizing the arsenical gold mineral by the bacteria.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and relates to an application method of additives in strengthening the oxidation of arsenic-containing gold ore bacteria, so as to realize the high-efficiency oxidation of arsenic-containing, especially high-arsenic, gold ore bacteria, thereby creating favorable conditions for gold extraction of arsenic-containing gold ore . Background technique [0002] With the massive development and utilization of gold resources, refractory gold ore has gradually become the main raw material for gold extraction. my country's arsenic-containing gold ore resources are relatively rich and widely distributed in all gold-producing provinces. Many refractory gold and silver ores contain varying amounts of arsenic, often in the form of arsenopyrite and FeAsS. At present, the methods for processing such gold mines mainly include roasting method, high pressure oxidation method and bacterial oxidation method. During oxi...

AI Technical Summary

Problems solved by technology

After research, it is found that various oxidants that are beneficial to the oxidation of As(III) in a sterile system include hydrogen peroxide, sodium hypochlorite, ferric chloride, potassium permanganate and ozone, etc., but these oxidants are all strong oxidants or sterilizers. Agents, after being introduced into the bacterial system, will have a toxic effect on the bacteria and affect the normal reproduction and growth of the bacteria